Fix config yaml to pass pointcloudFrame correctly

[pazeshun]

This PR fixes pointcloudFrame parameter location because it should be just under sensor_pointcloud_node:

sensor_pointcloud/src/sensor_pointcloud_node.cpp

Line 40 in b0e8301

nhp.param<std::string>(ros::names::append(parent_namespace, "pointcloudFrame"), pointcloudFrame, "map");

sensor_pointcloud/src/sensor_pointcloud_node.cpp

Line 26 in b0e8301

ros::NodeHandle nh, nhp("~");

sensor_pointcloud/src/sensor_pointcloud_node.cpp

Line 35 in b0e8301

std::string parent_namespace = ros::names::parentNamespace(pointcloudTopic);

sensor_pointcloud/src/sensor_pointcloud_node.cpp

Line 31 in b0e8301

std::string pointcloudTopic = ros::names::append(ros::this_node::getName(), "pointcloud");

This PR probably complements b0e8301